Two Victorian electoral districts have been abolished in a big reorganisation of the state's electoral boundaries which will affect up to one million voters.

The electorate of Doncaster, held by Community Services Minister Mary Wooldridge and the seat of Rodney, held by Nationals MP Paul Weller are to be abolished.

Mr Weller is "waiting for the dust to settle" before deciding on his next step.

"I'm the member for Rodney for the next 13 months and I'll be getting good outcomes for the people of Rodney for the next 12 months," he said.

In a statement Mary Wooldridge said, "I want to continue as a member of the Napthine Government after the next election and am confident that a suitable opportunity will be found."

Fifteen districts have had name changes and one new electorate, Eildon, has been created.

For example the district of Mitcham is being abolished but will be renamed Ringwood.

About 30 per cent of voters in the state will now have new electoral districts but only a little over 1 per cent have actually been moved into different districts.

About 6,750 voters in Moe are being moved from the Morwell district to Narracan.

About 3,500 voters in Inverloch are moving from Gippsland South to Bass.

In Toorak, 2,623 voters will move from seat of Malvern to Prahran and the suburb of Highton in Geelong will move from Geelong to South Barwon, affecting 5,755 voters.

In the Kiewa Valley, 2,342 voters will move into Benambra from the previous seat of Murray Valley which is now called Ovens Valley.Fifteen hundred voters in the Basin will move from Monbulk to Bayswater.

Victoria's Electoral Commissioner says rapidly increasing populations in Melbourne's north and north-west are largely responsible for a change in boundaries.

Electoral Commissioner Warwick Gately says it is important to have uniform voting numbers across the state.

"I think it's really important, when we project elector numbers as well and we get to mid-2018, only about eight districts will be slightly outside the quota," he said .

"None will be under the quota, so to a certain extent this redivision will be enduring, till at least 2018."

New boundaries raise questions about future of Hawthorn, Frankston MPs

Associate Professor Paul Strangio from Monash University says the new boundaries may put pressure on members of the old guard, such as former premier Ted Bailllieu.

"One would question what is his future role in the Coalition and therefore I would imagine he is a likely target seat, the seat of Hawthorn for someone like Mary Wooldridge," he told ABC local radio.

Independent Geoff Shaw's seat of Frankston has likely become even more marginal with the new boundaries spreading to the north."That only intensifies the focus on the future of Geoff Shaw and anxieties about any potential by-election before the 2014 election," Associate Professor Strangio said.

Bill Sykes, the Nationals MP for Benalla, says he will examine the changes to his electorate and consider his future after 11 years in Parliament.

"From a personal point of view the Benalla electorate has been carved up into three," he said.

"I'll make my decision based on what's best for the electorate, and also balancing my work-life approach.

Victorian Nationals Leader Peter Ryan says he is unhappy about the redistribution.

"This is a disappointing outcome for country Victoria in the first instance," he said.

"The seat of Rodney, a National-held seat has been abolished and that means one less voice in Parliament for country Victorians so it is therefore a disappointing result."

The boundaries are regularly changed to ensure that each vote has an equal value.

For the lower house the quota for an electoral district is 41,473, plus or minus 10 per cent.

The quota for an Upper House region is 456,207, plus or minus 10 per cent.